<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>
            {{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li @click="selectFood(food)" v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <CartControl :food="food"></CartControl>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <ShopCart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></ShopCart>
    <Food :food="selectedFood" ref="food"></Food>
  </div>
</template>

<script>
import axios from 'axios'
import BScroll from 'better-scroll'
import ShopCart from '@/pages/shopcart/ShopCart'
import CartControl from '@/pages/cartcontrol/cartcontrol'
import Food from '@/pages/food/Food'

const ERR_OK = 0;

export default {
  name: 'Goods',
  data () {
    return {
      goods:[],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  props: {
    seller: {
      type: Object
    }
  },
  components: {
    ShopCart,
    CartControl,
    Food
  },
  computed: {
    // 获取当前所在的索引值
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i + 1];
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i;
        }
      }
      return 0;
    },
    selectFoods() {
      let foods = [];
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food);
          }
        });
      });
      return foods;
    }
  },
  created () {
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
    axios.get('/api/goods')
      .then((res) => {
       res = res.data;
        if(res.errno == ERR_OK){
          this.goods=res.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          })
        }
      })
      .catch((err) => {
         console.log(err)
      })
  },
  methods: {
    selectFood (food) {
      this.selectedFood = food;
      this.$refs.food.show();
    },
    selectMenu (index) {
      // let foodList = this.$refs.foodsWrapper.querySelectorAll('.food-list-hook');
      // let el = foodList[index];
      // this.foodsScroll.scrollToElement(el, 300);
      this.foodsScroll.scrollTo(0, -this.listHeight[index], 300)
    },
    _initScroll() {
        this.menuScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });

        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          click: true,
          probeType: 3
        });

        this.foodsScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y));
        });
    },
    _calculateHeight() {
        let foodlist = this.$refs.foodsWrapper.querySelectorAll('.food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodlist.length; i++) {
          let item = foodlist[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
    }
  }
}
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
@import "../../common/stylus/mixin.styl"

  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        padding: 0 12px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        padding: 18px
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin-top: 2px
            font-size: 14px
            color: rgb(7,17,27)
            line-height: 14px
          .desc, .extra
            margin-top: 8px
            font-size: 10px
            color: rgb(147,153,159)
            line-height: 10px
          .extra
            line-height: 12px
            .count
              margin-right: 12px
          .price
            line-height: 24px
            font-weight: 700
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px

</style>
